Tight focusing of laser light using microlens array combined with radially polarised light converter

2021 ◽  
pp. 1-10
Author(s):  
Ye Yuan ◽  
Miao Xu
Keyword(s):  
Laser Light ◽  
Microlens Array ◽  
Tight Focusing ◽  
Polarised Light

Tight focusing of laser light using a polarization converter and an adaptive lens

2018 ◽  
Vol 57 (06) ◽  
pp. 1 ◽  
Author(s):  
Chenping Lan ◽  
Zuowei Zhou ◽  
Hongwen Ren
Keyword(s):  
Laser Light ◽  
Polarization Converter ◽  
Tight Focusing

Subwavelength grating-based spiral metalens for tight focusing of laser light

2019 ◽  
Vol 114 (14) ◽  
pp. 141107 ◽  
Author(s):  
Victor V. Kotlyar ◽  
Sergey S. Stafeev ◽  
Anton G. Nalimov ◽  
Liam O'Faolain
Keyword(s):  
Laser Light ◽  
Subwavelength Grating ◽  
Tight Focusing

scholarly journals Tight focusing of laser light using a chromium Fresnel zone plate

2017 ◽  
Vol 25 (17) ◽  
pp. 19662 ◽  
Author(s):  
V. V. Kotlyar ◽  
S. S. Stafeev ◽  
A. G. Nalimov ◽  
M. V. Kotlyar ◽  
L. O’Faolain ◽  
...  
Keyword(s):  
Laser Light ◽  
Fresnel Zone ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Tight Focusing

Microlens Array Homogenizer for Laser Illuminated Projector

2007 ◽  
Vol 364-366 ◽  
pp. 143-147
Author(s):  
Cheng Huan Chen ◽  
Chien Chuan Chen ◽  
Po Hung Yao
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Gaussian Beam ◽  
Uniform Distribution ◽  
Light Source ◽  
Laser Light ◽  
Polarized Light ◽  
Microlens Array ◽  
Diffractive Element ◽  
Laser Light Source

Laser light source is a potential illumination light source for non-emissive display applications, especially for liquid crystal projection displays, due to its requirement of low etendue source and highly polarized light. In order to make a conversion from a circular Gaussian beam profile to a rectangular uniform distribution, a microlens array has been proposed as a homogenizer. The analytical and experimental results show that the microlens array with a pitch of 100um under laser beam illumination works as a diffractive element, and a promising uniformity can be obtained with a stack of two microlens array.

Tight focusing of laser light propagated through subwavelength micropolarizer using Fresnel zone plate

2017 ◽  
Author(s):  
Sergey S. Stafeev ◽  
Anton G. Nalimov ◽  
Liam O'Faolain ◽  
Maria V. Kotlyar ◽  
Victor V. Kotlyar
Keyword(s):  
Laser Light ◽  
Fresnel Zone ◽  
Zone Plate ◽  
Fresnel Zone Plate ◽  
Tight Focusing

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Estimation of the noise in TEM image recorded on “imaging plate”

1987 ◽  
Vol 45 ◽  
pp. 748-749
Author(s):  
T. Oikawa ◽  
N. Mori ◽  
T. Katoh ◽  
Y. Harada ◽  
J. Miyahara ◽  
...  
Keyword(s):  
Low Dose ◽  
Quantum Noise ◽  
Laser Light ◽  
Imaging Plate ◽  
Total System ◽  
Electron Dose ◽  
X Ray ◽  
Image Recording ◽  
Recording Material ◽  
Highly Sensitive

The “Imaging Plate”(IP) is a highly sensitive image recording plate for X-ray radiography. It has been ascertained that the IP has superior properties and high practicability as an image recording material in a TEM. The sensitivity, one of the properties, is about 3 orders higher than that of conventional photo film. The IP is expected to be applied to low dose techniques. In this paper, an estimation of the quantum noise on the TEM image which appears in case of low electron dose on the IP is reported.In this experiment, the JEM-2000FX TEM and an IP having the same size as photo film were used.Figure 1 shows the schematic diagram of the total system including the TEM used in this experiment. In the reader, He-Ne laser light is scanned across the IP, then blue light is emitted from the IP.

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